+1，先建图，跑一遍floyd，再判断一遍，输出就ok了
by Deny_小田 @ 2016-09-04 08:20:38
是的嘛，超简单
by iodwad @ 2017-07-27 10:21:19
**楼上都是大佬 = =，那位给蒟蒻解释一下怎么判断 （ε=ε=ε=┏(゜ロ゜;)┛）**
by Ellen7ions @ 2017-11-03 20:02:55